Process for producing polyurethane
First Claim
1. A process for producing polyurethane by reacting an organic polyisocyanate, high-molecular weight polyol, and low-molecular weight, active hydrogen-containing compound with one another in the presence of catalysts and, if necessary, blowing agents/ foam stabilizers, and other adjuvants, said process comprising using a terminal 7-30 weight % of polyoxyethylene chain-containing polyether polyol having 2-4 hydroxyl groups and a hydroxyl equivalent higher than 750 [component (a)] as the high-molecular weight polyol, diaminotoluene [component (b)] and a low-molecular weight polyol having a hydroxyl equivalent of 30-100 [component (c),] as the low-molecular weight, active hydrogen-containing compound-, with the equivalent ratio of component (c) to component (a) being 8-12 and the equivalent ratio of component (b) to component (a) being 0.15-1.0.
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Abstract
Disclosed herein is a process for producing polyurethane moldings having good physical properties and good receptivity of electrostatic coating, said process comprising reacting a polyoxyethylene chain-containing polyether polyol having 2-4 hydroxyl groups and a hydroxyl equivalent higher than 750 as the high-molecular weight polyol, diaminotoluene and a low-molecular weight polyol having a hydroxyl equivalent of 30-100 as the low-molecular weight, active hydrogen-containing compound, with organic polyisocyanates in specific equivalent ratios respectively. The process may advantageously applied to injection reaction molding.
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10 Claims
- 1. A process for producing polyurethane by reacting an organic polyisocyanate, high-molecular weight polyol, and low-molecular weight, active hydrogen-containing compound with one another in the presence of catalysts and, if necessary, blowing agents/ foam stabilizers, and other adjuvants, said process comprising using a terminal 7-30 weight % of polyoxyethylene chain-containing polyether polyol having 2-4 hydroxyl groups and a hydroxyl equivalent higher than 750 [component (a)] as the high-molecular weight polyol, diaminotoluene [component (b)] and a low-molecular weight polyol having a hydroxyl equivalent of 30-100 [component (c),] as the low-molecular weight, active hydrogen-containing compound-, with the equivalent ratio of component (c) to component (a) being 8-12 and the equivalent ratio of component (b) to component (a) being 0.15-1.0.
Specification